What's So Special about Bottled Drinking Water?

This What's So Special about Bottled Drinking Water? lab resource also includes:

Is artesian water designed to be better, or is it just from wells similar to those in the city of Artesium? This experiment looks at many different types of bottled waters, including artesian. Using a soap mixture, scholars test to see which lathers the easiest to determine which waters are considered hard and which are considered soft.